| 碳酸盐预分离-紫外脉冲荧光法快速测定高硬度地下水中微量铀 |
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| 引用本文： | 付琳,王哲,王玉学,孙博.碳酸盐预分离-紫外脉冲荧光法快速测定高硬度地下水中微量铀[J].铀矿地质,2017(2):108-112. |
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| 作者姓名： | 付琳 王哲 王玉学 孙博 |
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| 作者单位： | 1. 核工业240研究所,辽宁沈阳,110032;2. 核工业大连应用技术研究所,辽宁大连,116034 |
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| 摘 要： | 建立了碳酸盐预分离-紫外脉冲荧光法快速测定高硬度地下水中微量铀的方法。试验发现,预先向20.00mL高硬度水样中加入70mg·mL~(-1)的碳酸钠溶液1.20mL,将大部分共存的Ca~(2+)和Mg~(2+)以碳酸盐沉淀的形式与UO_2(CO_3)_2~(2-)有效分离后,应用紫外脉冲荧光法测量铀浓度,不但溶液保持澄清,pH值也可保持在7~9的约束范围之内。该预处理程序简单快速,测量结果准确可靠。方法的检出限为0.02μg·L~(-1),全程加标回收率在99%~101%之间,测量结果的相对标准偏差(RSD)小于5%。
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| 关 键 词： | 紫外脉冲荧光法 高硬度地下水 微量铀 碳酸盐预分离 |
Rapid Determination of Trace Uranium in High Hardness Groundwater by Ultraviolet Pulse-induced Fluorescence Method Via the Pre-treatment Approach of Carbonate Separation |
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| FU Lin,WANG Zhe,WANG Yuxue,SUN Bo.Rapid Determination of Trace Uranium in High Hardness Groundwater by Ultraviolet Pulse-induced Fluorescence Method Via the Pre-treatment Approach of Carbonate Separation[J].Uranium Geology,2017(2):108-112. |
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| Authors: | FU Lin WANG Zhe WANG Yuxue SUN Bo |
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| Abstract: | In this paper,a new method was studied in detail for the determination of trace uranium in high hardness groundwater by ultraviolet pulse-induced fluorescence method via the pre-treatment approach of carbonate separation.Tests revealed that it is a very effective method to separate the UO2(CO3)22-from the Ca2+ and Mg2+ if adding 1.20mLNa2CO3 (70mg· mL-1) to the 20.00 mL tested high hardness groundwater.Moreover,no obvious fluorescence quenching happened and the pH is still maintained at 7-9 during measuring the fluorescence intensity.The pre-separation procedure is easy and quickly.The detection limit of this method is above 0.02μg · L-1,the recovery is in the range of 99％-101％,and the RSD is less than 5％. |
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| Keywords: | ultraviolet pulse-induced fluorescence method high hardness groundwater trace uranium carbonate pre-treatment |
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